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1 | #ifndef __LINUX_SMP_H |
2 | #define __LINUX_SMP_H |
3 | |
4 | /* |
5 | * Generic SMP support |
6 | * Alan Cox. <alan@redhat.com> |
7 | */ |
8 | |
9 | #include <linux/errno.h> |
10 | #include <linux/types.h> |
11 | #include <linux/list.h> |
12 | #include <linux/cpumask.h> |
13 | |
14 | extern void cpu_idle(void); |
15 | |
16 | struct call_single_data { |
17 | struct list_head list; |
18 | void (*func) (void *info); |
19 | void *info; |
20 | u16 flags; |
21 | u16 priv; |
22 | }; |
23 | |
24 | /* total number of cpus in this system (may exceed NR_CPUS) */ |
25 | extern unsigned int total_cpus; |
26 | |
27 | int smp_call_function_single(int cpuid, void (*func) (void *info), void *info, |
28 | int wait); |
29 | |
30 | #ifdef CONFIG_SMP |
31 | |
32 | #include <linux/preempt.h> |
33 | #include <linux/kernel.h> |
34 | #include <linux/compiler.h> |
35 | #include <linux/thread_info.h> |
36 | #include <asm/smp.h> |
37 | |
38 | /* |
39 | * main cross-CPU interfaces, handles INIT, TLB flush, STOP, etc. |
40 | * (defined in asm header): |
41 | */ |
42 | |
43 | /* |
44 | * stops all CPUs but the current one: |
45 | */ |
46 | extern void smp_send_stop(void); |
47 | |
48 | /* |
49 | * sends a 'reschedule' event to another CPU: |
50 | */ |
51 | extern void smp_send_reschedule(int cpu); |
52 | |
53 | |
54 | /* |
55 | * Prepare machine for booting other CPUs. |
56 | */ |
57 | extern void smp_prepare_cpus(unsigned int max_cpus); |
58 | |
59 | /* |
60 | * Bring a CPU up |
61 | */ |
62 | extern int __cpu_up(unsigned int cpunum); |
63 | |
64 | /* |
65 | * Final polishing of CPUs |
66 | */ |
67 | extern void smp_cpus_done(unsigned int max_cpus); |
68 | |
69 | /* |
70 | * Call a function on all other processors |
71 | */ |
72 | int smp_call_function(void(*func)(void *info), void *info, int wait); |
73 | void smp_call_function_many(const struct cpumask *mask, |
74 | void (*func)(void *info), void *info, bool wait); |
75 | |
76 | void __smp_call_function_single(int cpuid, struct call_single_data *data, |
77 | int wait); |
78 | |
79 | int smp_call_function_any(const struct cpumask *mask, |
80 | void (*func)(void *info), void *info, int wait); |
81 | |
82 | /* |
83 | * Generic and arch helpers |
84 | */ |
85 | #ifdef CONFIG_USE_GENERIC_SMP_HELPERS |
86 | void generic_smp_call_function_single_interrupt(void); |
87 | void generic_smp_call_function_interrupt(void); |
88 | void ipi_call_lock(void); |
89 | void ipi_call_unlock(void); |
90 | void ipi_call_lock_irq(void); |
91 | void ipi_call_unlock_irq(void); |
92 | #endif |
93 | |
94 | /* |
95 | * Call a function on all processors |
96 | */ |
97 | int on_each_cpu(void (*func) (void *info), void *info, int wait); |
98 | |
99 | #define MSG_ALL_BUT_SELF 0x8000 /* Assume <32768 CPU's */ |
100 | #define MSG_ALL 0x8001 |
101 | |
102 | #define MSG_INVALIDATE_TLB 0x0001 /* Remote processor TLB invalidate */ |
103 | #define MSG_STOP_CPU 0x0002 /* Sent to shut down slave CPU's |
104 | * when rebooting |
105 | */ |
106 | #define MSG_RESCHEDULE 0x0003 /* Reschedule request from master CPU*/ |
107 | #define MSG_CALL_FUNCTION 0x0004 /* Call function on all other CPUs */ |
108 | |
109 | /* |
110 | * Mark the boot cpu "online" so that it can call console drivers in |
111 | * printk() and can access its per-cpu storage. |
112 | */ |
113 | void smp_prepare_boot_cpu(void); |
114 | |
115 | extern unsigned int setup_max_cpus; |
116 | |
117 | #else /* !SMP */ |
118 | |
119 | static inline void smp_send_stop(void) { } |
120 | |
121 | /* |
122 | * These macros fold the SMP functionality into a single CPU system |
123 | */ |
124 | #define raw_smp_processor_id() 0 |
125 | static inline int up_smp_call_function(void (*func)(void *), void *info) |
126 | { |
127 | return 0; |
128 | } |
129 | #define smp_call_function(func, info, wait) \ |
130 | (up_smp_call_function(func, info)) |
131 | #define on_each_cpu(func,info,wait) \ |
132 | ({ \ |
133 | local_irq_disable(); \ |
134 | func(info); \ |
135 | local_irq_enable(); \ |
136 | 0; \ |
137 | }) |
138 | static inline void smp_send_reschedule(int cpu) { } |
139 | #define num_booting_cpus() 1 |
140 | #define smp_prepare_boot_cpu() do {} while (0) |
141 | #define smp_call_function_many(mask, func, info, wait) \ |
142 | (up_smp_call_function(func, info)) |
143 | static inline void init_call_single_data(void) { } |
144 | |
145 | static inline int |
146 | smp_call_function_any(const struct cpumask *mask, void (*func)(void *info), |
147 | void *info, int wait) |
148 | { |
149 | return smp_call_function_single(0, func, info, wait); |
150 | } |
151 | |
152 | #endif /* !SMP */ |
153 | |
154 | /* |
155 | * smp_processor_id(): get the current CPU ID. |
156 | * |
157 | * if DEBUG_PREEMPT is enabled then we check whether it is |
158 | * used in a preemption-safe way. (smp_processor_id() is safe |
159 | * if it's used in a preemption-off critical section, or in |
160 | * a thread that is bound to the current CPU.) |
161 | * |
162 | * NOTE: raw_smp_processor_id() is for internal use only |
163 | * (smp_processor_id() is the preferred variant), but in rare |
164 | * instances it might also be used to turn off false positives |
165 | * (i.e. smp_processor_id() use that the debugging code reports but |
166 | * which use for some reason is legal). Don't use this to hack around |
167 | * the warning message, as your code might not work under PREEMPT. |
168 | */ |
169 | #ifdef CONFIG_DEBUG_PREEMPT |
170 | extern unsigned int debug_smp_processor_id(void); |
171 | # define smp_processor_id() debug_smp_processor_id() |
172 | #else |
173 | # define smp_processor_id() raw_smp_processor_id() |
174 | #endif |
175 | |
176 | #define get_cpu() ({ preempt_disable(); smp_processor_id(); }) |
177 | #define put_cpu() preempt_enable() |
178 | |
179 | /* |
180 | * Callback to arch code if there's nosmp or maxcpus=0 on the |
181 | * boot command line: |
182 | */ |
183 | extern void arch_disable_smp_support(void); |
184 | |
185 | void smp_setup_processor_id(void); |
186 | |
187 | #endif /* __LINUX_SMP_H */ |
188 |
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